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<p>[QUOTE=&quot;Coinman1981, post: 703754, member: 20610&quot;]Proof coins from the 1970s and after are unmistakably mirror-like; the devices (basically, the raised parts of the design) on modern proof coins also appear frosted.</p><p><br /></p><p>The coins you have are clearly not proofs because of those reasons.. Also, proof coins are much better struck than business-strikes. You see the details more clearly on most proofs. </p><p><br /></p><p>&nbsp;Unfortunately for those who have SBAs, trying to sell them for a profit is hard, unless the coins are in MS 63+ grades or proof. 1981 was the last year a business-strike coin was made with the &quot;S&quot; mint mark; you will find that, historically, it was NOT San Francisco but, rather Philadelphia which made proof coins. San Francisco did not begin producing proofs until 1968. The &quot;disco era SBAs&quot; (as I call them -- 1979-1981, not including the 1999 run), along with Lincoln cents made from 1968-1974 are the two examples of business-strike coins made at the San Francisco mint after the 1960s.[/QUOTE]</p><p><br /></p>

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